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Heart Development

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BIOL 2005
Elizabeth Nisbet

Outline of Lecture 06 Heart Development Heart has a “nervous system”, the conduction system, in addition to spontaneous contractility I. Early heart development - At days 19-21, cardiogenic cords of the splanchnic mesoderm give rise to two endocardial tubes, embryonic folding allows apposition and fusion to form heart tube - Heart tube is surrounded by ventrally located pericardial sac - The cardiac mesentery is the dorsal mesocardium; it disintegrates, leaving heart tube suspended and forming transverse pericardial sinus - Heart tube consists of endothelium, cardiac jelly, myocardium, epicardium (inner to outer) - In week 3, the heart tube loops and fetal blood circulation begins II. Development of the heart - 4 divisions of the heart tube: bulbus cordis, primitive ventricle, primitive atrium, sinus venosus - Right atrium - Primitive atrium  pectinate muscle in right auricle - Sinus venosus  sinus venarum - Left atrium - Primitive atrium  left atrium - Pulmonary veins sprout, branch, and head toward lungs - Interatrial septum - Moon-shaped septum primum separates atria; right-left shunt first provided by foramen primum, then by foramen secundum - Septum secundum forms with foramen ovale shunt (later becomes fossa ovalis) - Together foramen secundum and foramen ovale provide atrial shunt, after birth fusion of septa closes shunt - Left and right
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